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Share Repurchase Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Oct. 31, 2015
Nov. 01, 2014
Disclosure Share Repurchase Activity [Abstract]        
Number of shares repurchased 6.2 11.4 21.8 26.0
Total cost $ 200 $ 433 $ 807 $ 1,016
Average per share cost including commissions (in dollars per share) $ 32.17 $ 37.95 $ 36.93 $ 39.15